G'day,

 

One of my sites has a hiccup with a server, which resulted in one of the SCADA runtime instances crashing.  This instance was being used as the SCADA-to-PI interface client so the net result of this was data stopped being sent to the PI Data Archive.

 

One of the Metallurgists called me a little while later asking if there was a problem because he stopped getting data in his ProcessBook pages.  We figured out the problem and got everything going again.  Unfortunately, by the time I got to fix it we had lost a couple of hours of data.  It wasn't a major disaster, but I wanted to try and get notified sooner without having to rely on someone noticing a problem.

 

Firstly, I created an Interface Template with a few attributes.  Most of these are just containers for now but I may end up using these for new functionality later.

 

Capture1.JPG

The InterfaceStatus attribute is a formula that compares if the value of the Reference attribute is greater than the value of the Threshold attribute.  If  Reference>Threshold then the interface is online (i.e. valid/healthy data) so the result stored in InterfaceStatus = TRUE.  If  Reference<Threshold, then InterfaceStatus=FALSE.

 

Then I created an Event Frame template...

 

Capture2.JPG

I'm just grabbing the main power incomer reading for now as I'm mostly interested in being notified of the event rather than getting plant info.

 

I then created the Interface Element and set up a new Analyses to trigger the event frame whenever the InterfaceStatus attribute = 0. (i.e. FALSE)

 

Capture3.JPG

 

Finally, I set up a new email notification so that I am sent an email whenever InterfaceStatus = FALSE

Capture4.JPG

 

Works like a charm!

 

I'm now looking at setting up two interfaces in HA arrangement.  I'll need to come up with a new way of detecting an interface failure as this example will only trigger if both interfaces fail.  I'll have a think about that and see what I can come up with.